One day, fifth grader Hinata Hoshino brings her friend Hana Shirosaki to her house, and Hinata's sister Miyako, a college student, falls in love with with Hana at first sight. Miyako manages to get along with Hana somehow, but her clumsy behavior and shyness, makes Hana wary. Even so, Hana gradually opens up to Miyako, who wants to become closer to her.
Kyou Nukui is a first year high school student hikikomori. His hobby is making Vocaloid songs and uploading them online. One day, he receives a message from a fan asking if they could meet up with him. At the meeting place, three elementary school girls were waiting for him. The three of them want to form a band and ask for Kyou's help.